You can use either one of the following syntaxes to set Boolean switches in PWB:
switch : [[yes|no|on|off|1|0]]
switch
The name of a PWB switch.
yes, on, 1
Enable the feature controlled by switch.
no, off, 0
Disable the feature controlled by switch.
[[no]]switch :
switch
Enable the feature controlled by switch.
noswitch
Disable the feature controlled by switch.